JP2002188166A - Watertight structure of manhole - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a watertight structure of a manhole that can prevent rainwater or the like from entering a protective cover and avoid damage due to icing. SOLUTION: The manhole has a watertight structure provided with a protective cover 21 including a lid receiving frame 24 and a protective lid 25 so as to cover an upper part of a synthetic resin (PVC) manhole 14. On the surface, packings 41 and 42 for stopping water between the lid receiving frame 24 and the paving material 26 provided on the outer periphery of the lid receiving frame 24 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a watertight structure of a manhole, and more particularly, to the infiltration of rainwater into an iron protective cover provided over a manhole made of a synthetic resin, for example, a vinyl chloride resin. The present invention relates to a watertight structure of a manhole for preventing water leakage.

[0002]

2. Description of the Related Art In recent years, pipes made of vinyl chloride resin (PVC pipes) are often used for sewer pipes and the like, and manholes made of vinyl chloride resin (manholes made of PVC) are also used as manholes. This PVC manhole has good sealing with the lid (inner lid) and does not allow odor to flow out, good connectivity with PVC pipes, good workability, low cost due to mass production, and dimensional accuracy Have high advantages. However, when this PVC manhole is installed on a roadway, an iron protective cover is installed so as to cover above the PVC manhole from the viewpoint of the strength of the lid.

[0003] The protective cover comprises a lid receiving frame formed of a cylindrical body having a diameter larger than that of the PVC manhole, and a protective lid for closing an opening of the lid receiving frame. Is mounted on a pedestal installed on a roadbed of which the surface is filled with a pavement material such as an asphalt mixture forming a road surface.

[0004]

However, in the conventional construction method, a small gap may be generated between the outer peripheral surface of the lid receiving frame and the pavement material due to vibration from a running vehicle or the like. When it occurs, rainwater or snowmelt water may enter the inner peripheral side of the lid receiving frame through the gap. At this time, since the PVC manhole has a good sealing property with the inner lid as described above, the rainwater that has entered the protective cover is not discharged through the PVC manhole, and the water enters the protective cover. May accumulate.

When the protective cover is provided with a burl hole closing member, for example, when a burl hole closing device with a hook as described in JP-A-2000-199233 is provided, a burl hole closing member is provided. Rainwater or the like enters the protective cover from between the closing piece that closes the hole and the burl hole.

If the water accumulated in the protective cover freezes and increases in volume, the protective cover is lifted by the ice, which may cause traffic injuries and damage to the inner cover of the PVC manhole. There was also.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a watertight structure of a manhole that can prevent rainwater or the like from entering a protective cover and avoid damage due to icing.

[0008]

In order to achieve the above object, the watertight structure of the manhole of the present invention comprises a lid receiving frame and a protective lid attached to the lid receiving frame so as to cover the upper part of the synthetic resin manhole. A watertight structure of a manhole provided with a protective cover, wherein packing is provided on an outer peripheral surface of the lid receiving frame for stopping water between a paving material constructed on an outer periphery of the lid receiving frame. I have. In the case where the protective cover has a burl hole closing member that closes the burl hole, a packing for stopping water between the burl hole and the burl hole closing member is provided.

[0009]

FIG. 1 is a sectional front view of an essential part showing an example of a watertight structure of a manhole according to the present invention, and FIG. 2 is a plan view of the same essential part.

The manhole includes a rising pipe 11 made of PVC connected to a PVC pipe (not shown) buried in the ground, and an inner lid 13 for closing an upper opening of the rising pipe 11 via a seal ring 12. A protective cover 21 made of iron is provided so as to cover the upper portion of the manhole 14 made of synthetic resin (made of PVC).

The protective cover 21 includes a ring-shaped pedestal 23 installed on the upper surface of a roadbed 22 having crushed stones or the like, a cylindrical lid receiving frame 24 mounted on the pedestal 23, And a protective lid 25 for closing the opening 24. The protective lid 25 is provided with a hooked burl hole closing device 31.

Further, on the outer peripheral surface of the lid receiving frame 24, in order to stop water between the outer peripheral surface of the lid receiving frame 24 and a pavement material 26 such as an asphalt mixture, a sheet-shaped covering the entire outer peripheral surface. A packing 41 and a ring-shaped packing 42 fitted at an intermediate position in the vertical direction of the outer peripheral surface are provided. The two packings 41, 42 are made of a rubber-based material suitable for waterproofing such as, for example, water-expandable rubber.
For example, it is attached to the outer peripheral surface of the lid receiving frame 24 by an adhesive.

By providing one or both of the packings 41 and 42 on the outer peripheral surface of the lid receiving frame 24, water can be stopped between the outer peripheral surface of the lid receiving frame 24 and the pavement material 26. Since it is possible to prevent rainwater or meltwater from flowing between the outer peripheral surface of the lid receiving frame 24 and the pavement material 26 and further along the pedestal 23 and entering the PVC manhole 14 in the protective cover 21, protection can be provided. Water does not accumulate in the cover 21, so that damage due to icing can be avoided.

As shown in this embodiment, the protective cover 25
When the bale hole closing device 31 is provided with a hook, a packing 43 similar to the above is provided around a blocking piece (bar hole closing member) 33 that closes the burl hole 32, and the burl hole 32 is closed by the packing 43. By stopping water between the closing piece 33, it is possible to prevent rainwater or the like from entering the protective cover 21 from this portion.

The cover receiving frame 24 of the protective cover 21
If the waterproofness between the protective cover 25 and the protective cover 25 is not sufficient, a ring-shaped packing or the like may be provided in this portion to stop the waterproofness.

[0016]

As described above, according to the watertight structure of the manhole of the present invention, it is possible to prevent rainwater or the like from entering the protective cover, so that damage due to icing can be avoided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an essential part showing one embodiment of a watertight structure of a manhole of the present invention.

FIG. 2 is a plan view of a main part in the same manner.

[Explanation of symbols]

11 ... rising pipe, 12 ... seal ring, 13 ... inner lid,
14 ... PVC manhole, 21 ... protective cover, 22 ... roadbed, 23 ... pedestal, 24 ... lid receiving frame, 25 ... protective lid, 26 ...
Pavement material, 31 ... Bar hole closing device with hook, 32 ... Bar hole, 33 ... Blocking piece, 41,42,43 ... Packing

Claims (2)

[Claims] 1. A watertight structure of a manhole provided with a protective cover including a lid receiving frame and a protective cover attached to the lid receiving frame so as to cover an upper part of the synthetic resin manhole, and an outer peripheral surface of the lid receiving frame. A watertight structure for a manhole, further comprising a packing for stopping water between the lid receiving frame and a pavement material constructed around the outer periphery of the lid receiving frame. 2. The protective cover according to claim 1, further comprising a burl hole closing member for closing the burl hole, and a packing for stopping water between the burl hole and the burl hole closing member. The watertight structure of a manhole according to claim 1.